CVE-2026-79990: GQL entry mutation `siteId` bypasses schema site scope, enabling cross-site content read/write/delete

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Hackrate). Independent of NVD's CPE analysis and usually ahead of it.

• craftcms cms

  • 5.0.0-RC1 and later · before 5.10.11affected · semver

Other highest-scoring records for the same primary product.

• CVE-2026-115934SQL injection leading to privilege escalation
  37Monitor
• CVE-2026-124427Craft CMS 5.0.0 before 5.11.2 GraphQL Schema Scope Bypass via prev/next
  37Monitor
• CVE-2026-123488Craft CMS 4.0.0 before 4.18.9 SQL Injection via Element Search Endpoint
  37Monitor

Published before and after this one in the same product

• ← EarlierCVE-2026-84802Sep 2, 2026 · Craft CMS 5.7.0 before 5.10.12 Information Disclosure via AssetsController
  21Monitor
• ← EarlierCVE-2026-79989Sep 2, 2026 · Arbitrary user password reset leading to administrator account takeover
  34Monitor
• Later →CVE-2026-79991Sep 2, 2026 · Authenticated SQL Injection via nested eager-loading criteria
  28Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

The endpoint fetches the record by the ID sent in the request, but never checks whether the record belongs to the requesting user.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1const invoice = await Invoice.findById(req.params.id);2res.json(invoice);

1const invoice = await Invoice.findOne({2  id: req.params.id,3  ownerId: req.user.id,4});5if (!invoice) return res.sendStatus(404);6res.json(invoice);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.